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Earthquakes in the UK

Sunday 19 May, 2013

News Brief

Thankfully the British Isles show low levels of violent seismic activity.

Full Story:

In spite of reports this morning (29/5/13) of a tremor off the North Wales coast, thankfully the British Isles show low levels of seismic activity. However, over the years many small earthquakes have been recorded.

The largest recorded onshore earthquake in modern times was on 17th July 1984 and had an epicentre close to todays quake near Trefor on the Lleyn Peninsula.
It is considered that this location may have also been the site of the largest earthquake recorded in historic times in 1247.

Whilst earthquakes have been systematically recorded in the UK since the late seventeenth century, monitoring with instruments was a relatively late development. It was not until the 1880’s that John Milne in collaboration with Japanese acquaintances developed an instrument that could detect and record shock waves. The 1903 earthquake centred on Derby was the first in the UK to be recorded with instruments which were located on the Wirral.

It is difficult to establish the first recorded instance of an earthquake in the UK as chroniclers often used the expression to describe landslides and even severe storms. However, the earliest reliable recording is thought to have been by Florentius, a Monk residing at Worcester Cathedral in 974.

An unusual image of geology in the making at Mam Tor in Derbyshire demonstrates "faulting" in layers of tarmac which have slid down the hillside.

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